Provided you are getting in both the colleges you have mentioned above it would depend mostly on you which to choose. At IET lucknow you will not get a NIT tag at iet lucknow you will not get great exposure as compared to north east nits on the other hand in north east nits you will not get to live in city like lucknow which is well connected and almost a metro city now both are more or less the same but all in all IET lucknow may be good choice for a student over north east nits unless he is from the northeast itself